Man this went into the dumper as fast as some of the stuff on road cycling. Must be all the rain we are going through.
As to Lance and Levi doing their own work. It is a pretty safe bet that a paid professional team mechanic does it for them.
Some of the best 50+ riders I know take crap care of their bikes. So the link between being a good rider and a good wrench is a no starter. As for me the only thing I have not done with a bike is face a bottom bracket and build a wheelset. Planning to learn how to build up a wheel when the snow fly's again. It has nothing to do with the LBS not doing it just my choice.
I think building bikes is a fine hobby just don't ask my wife for an opinion on that hobby.